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If Deepesh had walked 20 km/h faster he woulh have saved 1 hour in the distance of 60km. what is the usual speed of Deepesh?

Correct Answer: 100

Explanation:

Let the original speed  be x km/h, then


600 x - 600 x + 20 = 1  


 


600 x + 20 - x x x + 20 = 1   


 


x 2 + 120 x - 12000 = 0


 


x - 120 x - 100 = 0


 


Therefore,  original speed = 100km/h


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